本篇文档将介绍通过Java编程在PDF文档中绘制图形的方法。包括绘制矩形、椭圆形、不规则多边形、线条、弧线、曲线、扇形等等。针对方法中提供的思路,也可以自行变换图形设计思路,如菱形、梯形或者组合图形等。
使用工具:Free Spire.PDF for Java(免费版)
Jar****文件导入:
步骤1****:将安装包中lib文件夹下的两个文件复制到程序中新建的文件夹中(这里在程序中可新建一个文件夹并命名为Lib)
步骤2****:复制文件后,将两个添加引用到程序:选中这两个jar文件,点击鼠标右键,选择“Build Path” – “Add to Build Path”。完成引用。
Java****代码示例(供参考)
import java.awt.Color;
import java.awt.Point;
import java.awt.geom.Rectangle2D;
import com.spire.pdf.FileFormat;
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.graphics.*;
public class DrawShapes {
public static void main(String[] args) {
//创建PdfDocument对象
PdfDocument doc = new PdfDocument();
//添加一页
PdfPageBase page = doc.getPages().add();
//创建画笔、画刷
PdfPen pen =new PdfPen(new PdfRGBColor(Color.black),0.3);
PdfBrush brush= PdfBrushes.getGreenYellow();
//绘制矩形
Rectangle2D.Float rect1 = new Rectangle2D.Float(0, 20, 120, 50);//创建Rectangle2D对象,并指定图形在PDF页面中的大小、位置
PdfLinearGradientBrush linearGradientBrush = new PdfLinearGradientBrush(rect1,new PdfRGBColor(Color.PINK),new PdfRGBColor(Color.YELLOW),PdfLinearGradientMode.Horizontal);//填充图形颜色
page.getCanvas().drawRectangle(linearGradientBrush, rect1);//绘制矩形到页面
//绘制椭圆
Point centerStart= new Point(205,45);
Point centerEnd= new Point(205,45);
PdfRadialGradientBrush radialGradientBrush = new PdfRadialGradientBrush(centerStart,0,centerEnd,60,new PdfRGBColor(Color.white),new PdfRGBColor(Color.cyan));
Rectangle2D.Float rect2= new Rectangle2D.Float(180, 20, 50, 50);
page.getCanvas().drawEllipse(radialGradientBrush,rect2);
//绘制多边形
Point p1=new Point(290,70);
Point p2=new Point(310,45);
Point p3=new Point(325,60);
Point p4=new Point(340,20);
Point p5=new Point(370,70);
Point[] points = {p1, p2, p3, p4, p5};
page.getCanvas().drawPolygon(pen,brush, points);
//绘制弧形
float startAngle = 0;
float sweepAngle = 270;
Rectangle2D.Float rect3= new Rectangle2D.Float(0, 110, 50, 50);
page.getCanvas().drawArc(pen, rect3, startAngle, sweepAngle);
//绘制扇形
Rectangle2D.Float rect4= new Rectangle2D.Float(70, 110, 50, 50);
page.getCanvas().drawPie(pen, rect4, startAngle, sweepAngle);
//绘制直线
Point pStart=new Point(205,110);
Point pEnd=new Point(205,160);
page.getCanvas().drawLine(pen, pStart, pEnd);
//绘制贝塞尔曲线
Point startPoint = new Point(290, 135);
Point firstControlPoint = new Point(330, 70);
Point secondControlPoint = new Point(330, 200);
Point endPoint = new Point(370, 135);
page.getCanvas().drawBezier(pen, startPoint, firstControlPoint, secondControlPoint, endPoint);
//保存文档
doc.saveToFile("DrawShapes.pdf",FileFormat.PDF);
}
}
完成代码后,运行程序,生成文档。(如下图)
(本文完)
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